AttributeError: 'ProjectMessagesForm' object has no attribute 'cleaned_data'

class ProjectMessagesListView(FormMixin, ListView):
    template_name = 'project/project_messages_list.html'
    form_class = ProjectMessagesForm
    queryset = ProjectMessages.objects.all()
    success_url = reverse_lazy("messages")

    def post(self, request, *args, **kwargs):
        form_class = self.get_form_class()
        self.form = self.get_form(form_class)
        if self.request.method == 'POST':
            print(self.form.cleaned_data)
        return HttpResponseRedirect(self.get_success_url())

        if self.request.method == 'POST':
            if self.form.is_valid():
                print(self.form.cleaned_data)
            else:
                print('no')